Priority with different networks

Hello all,

I have to create a network with different priorities:

  • WAN is connected to cable connection.
    There is a LAN network for computers (192.168.1.0/24)
    There is a VoIP network with a PBX and VoIP phones (192.168.2.0/24)
    There is a wifi guest network (192.168.3.0/24)

I am using a RB750 router, I want to priorize first VoIP, the LAN and last guest wifi.

How could I configure this scenario? I am new in Mikrotik, I read about mangle, QoS, ques, but I don’t know how to do it.

I will appreciate your help.

Best regards.